IB/qib: Change QPN increment

Changing from +1 to +2 allows for better QP distribution across
receive contexts.
Signed-off-by: NMike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: NRoland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/qib/qib_qp.c

@@ -137,7 +137,7 @@ static int alloc_qpn(struct qib_devdata *dd, struct qib_qpn_table *qpt,
 		goto bail;
 	}
 
-	qpn = qpt->last + 1;
+	qpn = qpt->last + 2;
 	if (qpn >= QPN_MAX)
 		qpn = 2;
 	if (qpt->mask && ((qpn & qpt->mask) >> 1) >= dd->n_krcv_queues)